And in the east, Fourth Yacht Marina, (FYM) Grangemouth. 01324 665 071.They're open Sundays too. I've bought it from them in the past.
There is a standard car colour which is so close you'd be pushed to tell the difference. I've also used that. When I'm in the workshop I look it out and report back.

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OK, the grey were're talking about is Mariner Light Grey, it says on the tin and the very similar colour is Rover Gunmetal Metallic bought in the local garage for a couple of quid.